@ChrisMayLA6
I think Rayner stated the obvious when she said Starmer promised 'change' and is not delivering, and this is why he's so unpopular, and why the Greens are now sometimes polling ahead of Labour.
Nor do I think Starmer's perpetual excuse - be patient, change takes time - is credible, because it's not just a question of giving measures time to work, but of the timidity, and in some cases the direction, of the measures being taken - or not taken.
However, I think a Rayner leadership would merely tweak the Labour Leadership a little bit to the left, with little substantial change in either policy or popularity. It still wouldn't, for example, implement a programme taking the UK back to the social norms of it's neighbouring countries - public ownership of basic utilities, rent controls and other housing market reforms, acceptance of 'lived gender', employee participation, EU membership, etc, etc - and of course green transition (though Ed Miliband is the one light in the current Labour gloom).
I'm not talking radical politics here - just the old European Social Model that still exists (under attack) in the UK's neighbouring countries - but some more radical steps, such as establishment of a Commission on degrowth, would also of course be welcome.